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Open AccessArticle

Seasonal Variation of Captive Meagre Acoustic Signalling: A Manual and Automatic Recognition Approach

1
Departamento de Biologia Animal and cE3c - Centre for Ecology, Evolution and Environmental Changes, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
2
Faculdade de Ciências e Tecnologia da Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
3
Instituto Português do Mar e da Atmosfera, Av. 5 de Outubro, 8700-305 Olhão, Portugal
4
MARE – Marine and Environmental Sciences Centre, ISPA-Instituto Universitário, 1149-041 Lisboa, Portugal
5
Departamento de Biologia Animal, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
*
Author to whom correspondence should be addressed.
Fishes 2019, 4(2), 28; https://doi.org/10.3390/fishes4020028
Received: 1 April 2019 / Revised: 12 April 2019 / Accepted: 12 April 2019 / Published: 18 April 2019
Many species rely on acoustic communication to fulfil several functions such as advertisement and mediation of social interactions (e.g., agonistic, mating). Therefore, fish calls can be an important source of information, e.g., to recognize reproductive periods or to assess fish welfare, and should be considered a potential non-intrusive tool in aquaculture management. Assessing fish acoustic activity, however, often requires long sound recordings. To analyse these long recordings automatic methods are invaluable tools to detect and extract the relevant biological information. Here we present a study to characterize meagre (Argyrosomus regius) acoustic activity during social contexts in captivity using an automatic pattern-recognition methodology based on the Hidden Markov Model. Calls produced by meagre during the breading season showed a richer repertoire than previously reported. Besides the dense choruses composed by grunts already known for this species, meagre emitted successive series of isolated pulses, audible as ‘knocks’. Grunts with a variable number of pulses were also registered. The overall acoustic activity was concurrent with the number of spawning events. A diel call rhythms exhibit peak of calling activity from 15:00 to midnight. In addition, grunt acoustic parameters varied significantly along the reproduction season. These results open the possibility to use the meagre vocal activity to predict breeding and approaching spawning periods in aquaculture management. View Full-Text
Keywords: fish behaviour and welfare; fish acoustic communication; soniferous fish; vocal fish; sound production; aquaculture; Sciaenidae fish behaviour and welfare; fish acoustic communication; soniferous fish; vocal fish; sound production; aquaculture; Sciaenidae
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Vieira, M.; Pereira, B.P.; Pousão-Ferreira, P.; Fonseca, P.J.; Amorim, M.C.P. Seasonal Variation of Captive Meagre Acoustic Signalling: A Manual and Automatic Recognition Approach. Fishes 2019, 4, 28.

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